def main():
    s = input().strip()
    t = {"oda": "yukiko", "yukiko": "oda"}[s]
    c = 0
    for _ in range(8):
        line = input()
        c += line.count('b') + line.count('w')
    print(s if c % 2 == 0 else t)
    
if __name__ == '__main__':
    main()